Make ExtensionIconSet::ContainsPath use StringPiece.

extensions/common/extension_icon_set.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_COMMON_EXTENSION_ICON_SET_H_
 #define EXTENSIONS_COMMON_EXTENSION_ICON_SET_H_
 
 #include <map>
 #include <set>
 #include <string>
 
+#include "base/strings/string_piece.h"
+
 namespace base {
 class FilePath;
 }
 
 // Represents the set of icons for an extension.
 class ExtensionIconSet {
  public:
   // Get an icon from the set, optionally falling back to a smaller or bigger
   // size. MatchType is exclusive (do not OR them together).
   enum MatchType {
@@ skipping 17 matching lines @@
 
   // Add an icon path to the set. If a path for the specified size is already
   // present, it is overwritten.
   void Add(int size, const std::string& path);
 
   // Gets path value of the icon found when searching for |size| using
   // |mathc_type|.
   const std::string& Get(int size, MatchType match_type) const;
 
   // Returns true iff the set contains the specified path.
-  bool ContainsPath(const std::string& path) const;
+  bool ContainsPath(base::StringPiece path) const;
 
   // Returns icon size if the set contains the specified path or 0 if not found.
-  int GetIconSizeFromPath(const std::string& path) const;
+  int GetIconSizeFromPath(base::StringPiece path) const;
 
   // Add the paths of all icons in this set into |paths|, handling the
   // conversion of (string) -> (base::FilePath). Note that these paths are not
   // validated in any way, so they may be invalid paths or reference
   // nonexistent files.
   void GetPaths(std::set<base::FilePath>* paths) const;
 
  private:
   IconMap map_;
 };
 
 #endif  // EXTENSIONS_COMMON_EXTENSION_ICON_SET_H_